File:DeMorganFourColour.png
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 00:08, 19 June 2012 | 1,107 × 1,193 (264 KB) | commons>Snorri95 | Extract from De Morgan's original letter to Hamilton about the four colour conjecture, October 23 1852. Trinity College, Dublin. |
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